Comment 2 for bug 1859010

I've been unable to recreate this on a Focal machine which I just installed sbuild on.

bdmurray@clean-focal-amd64:~$ sbuild --version
sbuild (Debian sbuild) 0.78.1 (09 February 2019)

Written by Roman Hodek, James Troup, Ben Collins, Ryan Murray, Rick
Younie, Francesco Paolo Lovergine, Michael Banck, Roger Leigh and
Andres Mejia.
...
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
bdmurray@clean-focal-amd64:~$ apt-cache policy sbuild
sbuild:
  Installed: 0.78.1-2ubuntu1
  Candidate: 0.78.1-2ubuntu1
  Version table:
 *** 0.78.1-2ubuntu1 500
        500 http://192.168.10.7/ubuntu focal/main amd64 Packages
        500 http://192.168.10.7/ubuntu focal/main i386 Packages
        100 /var/lib/dpkg/status
bdmurray@clean-focal-amd64:~$ ls -lh /usr/sbin/sendmail
ls: cannot access '/usr/sbin/sendmail': No such file or directory

Can you give us any more details about your configuration?